Spade drill insert having helical margins

a technology of helical margins and inserts, which is applied in the direction of swing drills, manufacturing tools, wood boring tools, etc., can solve the problems of increased heat buildup on the insert, excessive exit chatter, and reducing the stability of the spade drill, so as to achieve the effect of increasing stability
US20050100419A1Active Publication Date: 2005-05-12ALLIED MASCH & ENG CORP
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
ALLIED MASCH & ENG CORP
Publication Date
2005-05-12

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Abstract

A spade drill insert and drilling tool assembly is provided wherein the lands of the spade drill insert have helical margins which provide increased stability during cutting operations. The margin may have a helical trailing side or leading side, a parallel helical margin, or may also include a gullet or flute adjacent the helical margin.
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Description

TECHNICAL FIELD

[0001] This application claims the benefit of U.S. provisional patent application Ser. No. 60 / 518,205, filed Nov. 7, 2003, and is hereby incorporated by reference. The invention relates generally to a spade drill insert to be placed into a tool holder for boring holes into metals. More specifically, the invention relates to a spade drill insert having helical margins which provide increased stability during cutting operations.BACKGROUND OF THE INVENTION

[0002] Drilling systems are frequently used to provide cylindrical holes in metallic workpieces. The cutting or boring action of the drill system may be carried out by an elongated, substantially cylindrical drilling tool, such as a combination of a tool holder and a spade drill insert, which is selectively attached thereto. Such an arrangement may then be used in an application wherein one end of the tool holder is securely mounted in a driving apparatus, which rotates the holder about its longitudinal axis. At the o...

Claims

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